#include <tuple>
#include <iostream>
#include <string>
#include <stdexcept>

std::tuple<double, char, std::string> get_student(int id)
{
  if (id == 0) return std::make_tuple(3.8, 'A', "Lisa Simpson");
  if (id == 1) return std::make_tuple(2.9, 'C', "Milhouse Van Houten");
  if (id == 2) return std::make_tuple(1.7, 'D', "Ralph Wiggum");
  throw std::invalid_argument("id");
}

int main()
{
  auto student0 = get_student(0);
  std::cout << "ID: 0, "
    << "GPA: " << std::get<0>(student0) << ", "
    << "grade: " << std::get<1>(student0) << ", "
    << "name: " << std::get<2>(student0) << '\n';

  double gpa1;
  char grade1;
  std::string name1;
  std::tie(gpa1, grade1, name1) = get_student(1);
  std::cout << "ID: 1, "
    << "GPA: " << gpa1 << ", "
    << "grade: " << grade1 << ", "
    << "name: " << name1 << '\n';
}
